Use fresh connections for Redshift
Use fresh connections for Redshift

Consistently seeing this error when the schema is queried for a load:
```PG::ConnectionBad: PQconsumeInput() SSL error: decryption failed or bad record mac

  /home/mlfowler/git/bigshift/lib/bigshift/cli.rb:237:in `async_exec'
  /home/mlfowler/git/bigshift/lib/bigshift/cli.rb:237:in
`rs_connection'```

iconara/bigshift